Abstract
The problem of the interaction between cellulose hydrate and water in the vapour and in the liquid phase is considered with cellulose-hydrate membranes with an open structure being taken as an example. Under conditions of enhanced humidity, it has been shown that a tendency is observed towards the postcrystallization of the hydrocellulose which leads to densification of the structure because of the formation of new physical nodes and the ratio between the free and the combined water in the gel is displaced towards a reduction in the amount of the former. This results in a change in the membranes' permeability with respect to water and with respect to substance dissolved in water.
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